Dental instrument.



. BATENTED OCT. 9, 1906.

T. GOODHUGH. DENTAL INSTRUMENT.

APPLICATION FILED MAR.13, 1906.

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a v UNITED STATES PATENT OFFICE.

THOMAS GOODHUGH, OF SUTTON, ENGLAND, ASSIGNOR TO OLAUDIUS ASH SONS &COMPANY 1905 LIMITED, OF LONDON, ENGLAND.

DENTAL INSTRUMENT.

Specification of Letters Patent.

Patented Oct. 9,1906.

Application filed March 13, 1906. Serial No. 305.742.

Be it known that I, THOMAS GooDnUen, a subject of His Majesty the Kingof Great Britain, and a resident of Sutton, in the county of Surrey,England, have invented a certain new and useful Improved DentalInstrument, of which the following is a specification.

The inventlon relates to an improved dental instrument for filling theroots or fangs of teeth with stopping or cement after the extraction orkilling of the nerve.

The present invention is designed with a view to effecting certainimprovements in such instruments as have been hitherto constructed witha view to enable the filling operation to be carried out with greaterfacility and more expeditiously than heretofore, and to this end themeans for introducing the stopping medium comprises a species of syrmgehaving a rotatable nozzle through the end of which the cement or thelike is ejected and which rotatable nozzle enables the instrument to beused in any position, whereby cavities however awkwardly situated may bereached with facility and despatch.

In the accompanying drawings. Figure 1 is a longitudinal section, to anenlarged scale, through a syringe constructed in accordance with thisinvention; and Figs. 2, 3, and 4 are detailed views of the separatedparts in elevation.

In its main features the device comprises a receptacle 1 for the cementor the like and a rotatable nozzle 2, through which it is ejected. Ashaft or spindle 4, which passes through a tubular stem 3, is providedwith a flexible part 5, carrying a piston 6, the other end of the shaft4 being provided with means whereby it is afforded an endwise movementwithout rotation to cause the isto'n 6 to eject the cement or the likefrom t e receptacle 1 into the nerve-cavity of the tooth to be stopped.

A convenient means for imparting an endwise movement only to the shaft 4consists in forming a shoulder or collar 7 near one end to form anabutment for an exteriorly-threaded sleeve 8, which loosely surroundsthe extremity 9 of said shaft and terminates in a milled nut 10 or thelike. The screw-thread on the sleeve 8 engages an internal thread in oneend of a cap 11, which in turn is adapted to be screwed atits other endonto either the buttend of the tubular stem 3 of the device or, asshown, to a part 15, screwed to said stem and having a wingedfinger-piece 17 for convenience in handling' The extremity 9 of theshaft 4 is confined in the sleeve 8 by having its end burred over, asshown at 12, or by a collar or shoulder sweated thereon or by any otherconvenient means.

The iston 6 is removably carried in the end of t e flexible part 5 ofthe shaft and approximately fits the receptacle 1 for the cement. It ispreferred, however, before using the syringe to insert a loose Washer 16be tween the piston and the cement, whereby the escape ofthe latter backinto the receptacle when pressure is exerted is prevented.

The receptacle 1 is conveniently attached to one end of the tubular stem3 (which is curved, asshown, for convenience in using the device) bybeing movably carried by an internally-threaded connector 13, which isadapted to be screwed up against a shoulder 14 of an externally-screwedtubularpiece or collar attached to stem 3. receptacle 1 is confinedwithin the connector by its end and also the end of the part 13 beingburred or turned over, so that it may rotate freely, but cannot becomedetached therefrom, and the nozzle 2, which maybe bent to an angle, asshown, is attached, preferably removably, as by screwing, to the lowerextremity of the receptacle, so that it can rotate or turn with it.

In operation the receptacle 1 is filled with the cement or stoppingmedium by unscrewing its connected part 13 from shoulder 14 and securingit again in position. The nozzle is then inserted into the cavity in theroot of the tooth and the milled head 10 at the buttend of the syringeturned, whereby through the engagement of the threaded sleeve 8, towhich it is attached, with the cap 11 an endwise or longitudinalmovement of the shaft in an outward direction is effected, whereby thepiston is caused to press the cement out through the nozzle into thecavity of the tooth to be stopped until same is filled, when the nozzlecan be withdrawn without fear of loosening the cement or the like ordisturbing it in any way.

The above-described construction enables The end of the the parts ofwhich the device is composed to be readily disconnected for purposes ofrepair, cleansing, and sterilization.

What I claim is 1. In an instrument for filling teeth with stoppingmedium and in combination a receptacle for the stopping medium, arotatable nozzle in connection therewith, a piston adapted to force thecontents of thereceptacle out through the nozzle, a shaft having aflexible end carrying said piston, and means for imparting endwisemovement to said shaft to operate the piston.

2. In an instrument for filling teeth with stopping medium and incombination, a re ceptacle for the stopping medium, a rotatable nozzle'in connection therewith, a piston adapted to force the contents of thereceptacle out through the nozzle, a shaft having a flexible endcarrying said piston, a tubular stem containing said shaft and to'whichstem said receptacle is movably attached, and means for impartingendwise movement to said shaft to operate the piston.

3. In an instrument for filling teeth with stopping medium and incombination, a re ceptacle for the stopping medium, a rotatable nozzleconnected therewith, a piston adapted to force the contents of thereceptacle out through the nozzle, a shaft having a flexible end towhich said piston is connected, and rotative means connected with saidshaft to impart endwise movement to the latter.

4. In an instrument for filling teeth with stopping medium, and incombination, a receptacle for the stopping medium, a rotatable nozzleconnected therewith, a piston adapted to force the contents of thereceptacle out through the nozzle, a movable shaft connected with saidpiston, a threaded sleeve in which said shaft is journaled, and meansfor rotating said sleeve to impart endwise movement to the shaft and thepiston.

5. In an instrument for filling teethwith stopping medium, and incombination, a receptacle for the stopping medium, a nozzle inconnection therewith, a piston adapted to force the contents of thereceptacle out through the nozzle, a movable shaft to which said pistonis connected, a tubular stem containing said shaft and to which stem thereceptacle is movably attached, a threaded part carried by the tubularstem, a threaded cap engaging said part, a threaded sleeve looselyconnected with said shaft and engaging said threaded cap, and afinger-piece for rotating the sleeve to impart endwise movement to theshaft and the piston.

6. In an instrument for filling teeth with stopping medium, and incombination, a receptacle for the stopping medium, a rotatable nozzle inconnection therewith, a piston adapted to force the contents of thereceptacle out through the nozzle, a movable shaft to which said pistonis attached, a projection on said shaft and means engaging saidprojection to impart endwise movement thereto and to the piston.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

THOMAS GOODHUGH.

Witnesses:

H. D. JAMESON, A. NUTTING.

